c＃.net网格应用搜索页面

Question

尝试使用https://msdn.microsoft.com/en-us/library/windows/apps/xaml/hh868180.aspx

中的指南

我的应用包含私人教练，私人教练包含他们的客户。 我希望能够搜索客户。

这就是我的目标：我可以在first / lastname上搜索客户，它会说出有多少结果，IE结果（3），但它不会显示它们。

我已经包含了我的数据：

using PersonalTrainerGridApp.Data;

if中的navigationHelper_LoadState声明令我感到困惑，我不确定其中包含哪些内容，而且我不确定Filter_Checked是否正确

任何人都有一些指示？谢谢格式化！

private async void navigationHelper_LoadState(object sender, LoadStateEventArgs e)
    {
        var queryText = e.NavigationParameter as String;
        // Initialize the results list.
        AllResultsCollection = new Dictionary<string, IEnumerable<SampleDataSource>>();

        // Keep track of the number of matching items. 
        var totalMatchingItems = 0;
        var filterList = new List<Filter>();
        var groups = await SampleDataSource.GetPersonalTrainerAsync();

        foreach (var group in groups)
        {
            var matchingItems = group.Customers.Where(
                item => 
                    item.FirstName.IndexOf(
                        queryText, StringComparison.CurrentCultureIgnoreCase) > -1 || item.LastName.IndexOf(
                        queryText, StringComparison.CurrentCultureIgnoreCase) > -1 );

            int numberOfMatchingItems = matchingItems.Count();
            totalMatchingItems += numberOfMatchingItems;
            if (numberOfMatchingItems > 0)
            {
                AllResultsCollection.Add(group.Customers, matchingItems);
                filterList.Add(new Filter(group.Customers, numberOfMatchingItems));
            }

        }

        // Create an entry for "All" for viewing all search results. 
        filterList.Insert(0, new Filter("All", totalMatchingItems, true));

        // Communicate results through the view model
        this.DefaultViewModel["QueryText"] = '\"' + queryText + '\"';
        this.DefaultViewModel["Filters"] = filterList;
        this.DefaultViewModel["ShowFilters"] = true;

    }

    /// <summary>
    /// Invoked when a filter is selected using a RadioButton when not snapped.
    /// </summary>
    /// <param name="sender">The selected RadioButton instance.</param>
    /// <param name="e">Event data describing how the RadioButton was selected.</param>
    void Filter_Checked(object sender, RoutedEventArgs e)
    {
        // Retrieve the data context of the sender (the selected radio button).
        // This gives us the selected Filter object. 
        var filter = (sender as FrameworkElement).DataContext as Filter;

        // Mirror the change into the CollectionViewSource.
        // This is most likely not needed.
        if (filtersViewSource.View != null)
        {
            filtersViewSource.View.MoveCurrentTo(filter);
        }

        // Determine which filter was selected
        if (filter != null)
        {
            // Mirror the results into the corresponding Filter object to allow the
            // RadioButton representation used when not snapped to reflect the change
            filter.Active = true;

            // TODO: Respond to the change in active filter by setting this.DefaultViewModel["Results"]
            //       to a collection of items with bindable Image, Title, Subtitle, and Description properties

            if (filter.Name.Equals("All"))
            {
                var tempResults = new List<SampleDataSource>();

                // Add the items from each group to the temporary results
                // list. 
                foreach (var group in AllResultsCollection)
                {
                    tempResults.AddRange(group.Value);

                }

                // Display the items.
                this.DefaultViewModel["Results"] = tempResults;
            }
            else if (AllResultsCollection.ContainsKey(filter.Name))
            {
                this.DefaultViewModel["Results"] =
                  new List<SampleDataSource>(AllResultsCollection[filter.Name]);
            }

            // Ensure results are found
            object results;
            ICollection resultsCollection;
            if (this.DefaultViewModel.TryGetValue("Results", out results) &&
                (resultsCollection = results as ICollection) != null &&
                resultsCollection.Count != 0)
            {
                VisualStateManager.GoToState(this, "ResultsFound", true);
                return;
            }
        }

        // Display informational text when there are no search results.
        VisualStateManager.GoToState(this, "NoResultsFound", true);
    }

提前致谢，非常感谢： - ）